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HVAC Thermostat Wire Color Code Identifier

Identify standard HVAC thermostat wire color codes (R, C, W, Y, G, O/B) and terminal relay connections across heat pumps and furnaces.

Input Parameters

Auto-calculates on change
Quick Scenario Presets:

Live Edge Calculation

< 5ms latency
Recommended Terminal Code
C
Terminal Circuit Function
24VAC Common Ground Return Wire (Continuous Power)
Control Circuit Voltage
24VAC Neutral
Wiring Connection Guide
Blue wire connects to terminal C (24VAC Common Ground Return Wire (Continuous Power)).
Blue wire connects to terminal C (24VAC Common Ground Return Wire (Continuous Power)).

Underlying Computational Formula

R=24VAC Power; C=24VAC Common Ground; W=Heat Relay; Y=Cooling Contactor; G=Indoor Fan; O/B=Reversing Valve

Frequently Asked Questions

How does the HVAC Thermostat Wire Color Code Identifier calculate outputs?

This engine executes deterministic calculations on the Cloudflare edge runtime using the standard formula: R=24VAC Power; C=24VAC Common Ground; W=Heat Relay; Y=Cooling Contactor; G=Indoor Fan; O/B=Reversing Valve. Calculations execute in under 10ms with zero client-side JavaScript hydration lag.

Can I automate this calculation with an API or AI agent?

Yes. POST to https://figiva.com/api/calculate/thermostat-wiring-color-code/ with parameter keys matching this form. You will receive structured JSON results with zero hallucination.

Is this calculator completely free?

Yes. All calculation engines on CalcSite by Figiva are 100% free with zero paywalls, zero registration requirements, and zero advertising cookies.

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